Sewing-machine



(ModeL) P KERN 2Sheets-Sheet 1.

SEWING MACHINE.

No. 479,369. Patented July 19, 1892.

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2 Sheets-Sheet 2.

F. KERN.

SEWING MACHINE.

Patented July 19, 1892.

(ModeL) UNITED STATES PATENT QEFICE.

FERDINAND KERN, OF LINDEN, NE W JERSEY, ASSIGNOR TO THE KERN MULTIPLEMACHINE COMPANY, OF NEW JERSEY.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 479,369, dated July 19,1892. Application filed November ,3, 1891. Serial No. 410,716. (ModeL)To all whom it may concern:

Be it known that I, FERDINAND KERN, of Linden, Union county, State ofNew Jersey, have invented a new and useful Improvement inSewing-Machines, of which the following is a specification.

Figures 1, 2, and 3 represent the work done by the machine at variousstages. Fig. 4 is an elevation looking toward one of the shuttles. Fig.5 is an elevation looking toward the other of the shuttles. Fig. 6 is asectional elevation taken longitudinally through the axes of theshuttles, which are for clearness shown in their separated positions.Figs. 7, 8, and 9 are sectional details showing the relationship of theparts for different positions of the shuttles and needles. Figs. 10 and11 are enlarged details showing the relative positions of the needle,its eye, and groove, and the shuttle hook or horn and theseparating-finger at the instant when the point of the shuttle-horn ispassing the needle, the dotted lines indicating the deflection which theneedle receives by the separating-finger.

It is old to construct a duplex sewing-machine, such a machine beingdescribed in Letters Patent granted to me numbered 411,104, datedSeptember 17, 1889, and also numbered 447,880, dated March 10; 1891; butno means, so far as I am aware, have ever heretofore been devisedwhereby aduplex machine was capacitated for properly turning a corner;and to accomplish this is the object of my present invention. I willfirst describe in general terms by reference to Figs. 1, 2, and 3 how itis done and subsequently by reference to other figures by what mechanismit is done.

Referring to Fig. 1, suppose the two needles have sewed seams side byside in the direction of the arrow from a to b and from a to b. The feedis now continued until the needles have advanced, respectively, to c and0'; but as the inside needle advancesfrom b to c it is by mechanismhereinafter described prevented from forming stitches and producesmerely a row of punctures, as shown. The operation of the machine is nowsuspended and the work is revolved from the position shown in Fig. 1 tothe position shown in Fig. 2. This brings the inside needle from c toZ), the outside needle remaining at 0'. Then the operation of themachine is resumed and the needles advance in the direction of thearrow, Fig. 2, to b and 0, respectively, the outside needle producingthe ordinary stitches and the inside needle producing merely a series ofpunctures without stitching, as shown in Fig. 3 As soon as the insideneedle reaches the point I) the stitch-forming mechanism is thrown intofull operation and the two needles sew on the lines (Z and e in theordinary manner.

The manner in which I cansethe stitching to be suspended by the insideneedle is by preventing the loop in the needle-thread from being enteredby the shuttle, so that when the needle is withdrawn the thread has notpassed around the shuttle and there is nothing to hold the needle-threadbelow the fabric, and consequently it does not form a stitch, and it isWithdrawn by the retreat of the needle from the needle hole. shown thisprinciple applied to a duplex double threaded machine having a rotaryshuttle similar to that shown in the patents already referred to, and'adetailed description of many of the parts is therefore unnecessary.

f and f are the two needles arranged to reciprocate in unison.

g is the shaft for driving the shuttle h for the needle f.

g is the shaft for driving the shuttle h for the needle f.

2' and t" are respectively the shuttle-bobbins.

j and j are respectively the bobbin-cases, loosely mounted upon theshuttle-studs 7c and k, respectively. The bobbin-cases are provided withupwardly-projecting noses j j and tension-springs j j and are held bythe overlapping stationary springs j and 7' Z Z are the shuttle hooks orhorns by which the loops of the needle-threads are caught beneath thefabric.

m m are fingers which assist in the stitching operation.

n n are the stationary face-plates behind which the shuttles revolve inthe stationary heads 0 and 0.

When the stitching mechanism is in normal operation, every time theneedle descends,

In the drawings I have as shown in Fig. 7, the loop which it leaves inthe cloth is caught by the shuttle hook or horn Z and held and disposedof thereby in the well-known manner necessary for the formation of astitch.

p p are fingers by the forward movement of either of which thestitch-making operation of one needle may be suspended, while both theshuttle and the needle continue to go through their normal motions. Thisfinger in its forward position intercepts the normal path of the needle,and the finger is inclined laterally toward the top on the side next theneedle, so that the needle in its descent will impinge against thisincline and be deflected away from the point of the shuttle. The thread,extending from the eye of the needle on the side next the shuttle up tothe fabric, will lie between the needle and the finger 10 so long as theneedle remains down, in which position it is impossible for-the horn lof the shuttle to engage it, and the horn therefore passes the needlewithout engaging thethread, and when the needle ascends it carries thethread up and out of the fabric. When, therefore, the sewing of eitherneedle is to be suspended, the finger p or p, as the case may be, isthrust forward, and when the sewing is to be resumed it is retracted.

To mount and operate the fingers p and p, it will be found convenient toform the fingers on the extremities of the slides q q, held in guidewaysbetween the face-plates n n and the heads 0 0'. Any mechanism convenientfor the hand of the operator may be used for reciprocating these slides.In the case of the slide g, which in its retracted position is on thesame side of the needle as the operator, I prefer to employ a hand-lever'r, fulcrumed at s on the stationary head 0 and pivoted at q to theslide q, the action of which is limited by a stationary pin q,projecting into a notch in the slide g, which pin and the overlappingedge of the face-plate n serve to guide the slide q. I11 the case of theslide q, which in its retracted position is on the opposite side of theneedle from the operator, I prefer to extend the slide in the form of ayoke g around the face-plate n to a convenientpoint on the same sidewith the operator, at which point I connect it with a lever r, fulcrumedas s to the stationary head 0. In this case I prefer to employ thespiral spring .9 having a tendency to hold the yoke g in the retractedposition of the finger p, and I employ a pin 8 operating in a curvedslot in the yoke as a latch to hold the yoke forward in antagonism tothe spring 5 even when the operator has let go the lever o". The fingerp advances from the same side of the needle as that from which thethread-engaging point I advances and the finger p advances from the sameside of the needle as that from which the thread-engaging point Zadvances.

Having now described the form of mechanism in which I prefer to embodymy invention, I do not wish to be understood as limiting myself thereto,since I am well aware that the details may be varied and the principlemay be applied to other classes or constructions of sewing-machineswithout departing from what I consider to be the scope of my invention.

I claim- 1. In a sewing-machine, in combination, the needle, aloop-taker disposed in such position with respect to the needle as tonormally engage the needle-thread beneath the fabric and cooperate withthe needle in forming the stitch, and a member interposed between saidneedle and said loop-taker, whereby the engagement of the needle-threadby its looptaker is prevented, and asupport for said member admitting ofits being retracted topermit the formation of stitches, substantially asdescribed.

2. In a sewing-machine, in combination, the needle, a loop-takerdisposed in such position with respect to the needle as to normallyengage the needle-thread beneath the fabric and co-operate with theneedle in forming the stitch, a member whereby the needle-thread isshoved out of position to be engaged by said loop-taker, and meanswhereby said member may be retracted to permit the formation ofstitches, substantially as described.

3. In a duplex sewing-machine, in combination, the two needles, aloop-taker for each of said needles disposed in such position withrespect to the needle as to normally engage the needle-thread beneaththe fabric and cooperate with the needle in forming the stitch, and amovable member whereby the needlethread of one of said needles may beshoved out of position to prevent the engagement thereof by itsloop-taker, substantially as described.

4. In a sewing-machine, in combination, the needle, the loop-taker bywhich the needlethread is engaged beneath the fabric, an inclined memberlocated in the normal path of said needle, whereby said needle may bedeflected away from said loop-taker, and means whereby said member maybe retracted, leaving the needle and loop-taker in the normal relativeposition for forming stitches, substantially as described.

FERDINAND KERN. Witnesses:

JAMES S. GREVES, FRED L. KEMPER.

